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This article mainly explains "what is the SAP system and application server". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn what SAP system and application server are.

What is the SAP system?

(this paper only discusses the SAP system based on ABAP technology stack.)

The SAP system is an integral part of the SAP solution and is a set of installable software systems that implement specific business functions.

The usual components of a SAP system:

(1) Database

(2) one or more application server instances (Java or ABAP)

(3) Central service instance (central services), such as message server or Enqueue server

Each SAP system is uniquely identified by its system ID, which is a three-digit character consisting of uppercase letters or numbers, such as AG3.

What is an application server instance-Application Server instance

The code of the SAP system runs on the SAP application server instance, thus serving tens of millions of SAP customers around the world.

The application server instance is a physical server, which not only installs the SAP Netweaver platform-level software, but also installs several software component on the Netweaver. One or more software component are combined to realize the business functions of a domain.

Application server instances can be started, shut down, and monitored by tools. Each application server instance is identified by a combination of a host name and an instance number, where the instance number consists of two letters or numbers.

These application server instances are divided into different types according to their different uses, which are roughly as follows:

(1) ABAP server example: running SAP system ABAP code on the server, running different types of work processes, such as dialogue work process, background processing work process, update task work process, print task work process and so on. Each different type of worker process handles different tasks.

(2) ABAP SAP Central Services instances (ASCS instances)-Central service instance. Each SAP system can be composed of multiple ABAP server instances, but there can only be one ASCS instance, which includes a message server and an Enqueue server, the former is used to coordinate the communication between multiple ABAP servers, and the latter is responsible for lock management in SAP services. In addition, the load balancing of SAP system is also handled by ASCS instances.

Depending on the functionality of the SAP system, there are other optional application server instances, such as TREX server instances that focus on enterprise search implementation (Enterprise Search), Web Dispatcher instances, and so on.

Let's take a look at a specific example to deepen our understanding of the nouns that appear above.

The following picture shows the foreground interface of a SAP CRM system, and the corresponding system ID in the background is AG3. In the background system, we can log in using a client software called SAPGUI.

From the figure below, we can see that the ID of the SAP system is AG3, as well as the network address of the message server.

This AG3 system consists of several application server instances, and the instance I am currently going to log in to is ID 56. 0.

Enter your user name and password in the login interface to log in to the SAP system:

After logging in successfully, you can see the database details corresponding to the SAP server and the type of operating system currently installed in the SAP Status menu:

Using the transaction code SM51, you can view the names and hostnames of the three application server instances of the SAP system. We are currently logging in to the instance that ends in 56.

At this point, I believe you have a deeper understanding of "what is the SAP system and application server". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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